Comment 9 for bug 143784

This change has to be reverted on the release branches, as it
breaks semantics of peoples *persistent data* with no possibility
of correct BBB.

On the trunk, such a change should come with an *option" to enable
the new semantics; that option should be *disabled* through
at least the next release, at which point it might safely be
enabled.

I will revert on the 2.9 and 2.10 branches.